linux-kernel - Re: [PATCH 00/26] Permit filesystem local caching

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Date:	Wed, 16 Jan 2008 16:55:31 +0000
From:	David Howells <dhowells@...hat.com>
To:	Kyle Moffett <mrlinuxman@....com>
Cc:	dhowells@...hat.com, sds@...ho.nsa.gov, casey@...aufler-ca.com,
	Trond.Myklebust@...app.com, npiggin@...e.de,
	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 00/26] Permit filesystem local caching

Kyle Moffett <mrlinuxman@....com> wrote:

> One vaguely related question:  Is there presently any way to adjust the
> per-user max-key-data limit?

There's no reason there can't be.  It just needs a policy deciding.  Do we
have:

 (1) One control for all.

 (2) One control for all non-root users; no quotas on root.

 (3) One control for root, one control for all non-root users.

 (3) Separate controls for all users.

Should this be a ulimit?  Should a non-root user be able to adjust their own
quotas within limits set by root?

How should the quota be accessed?  The obvious way is to have /proc or /sys
controls.

Non-root quotas tend to be transitory.  When the user_struct pinning them goes
out of scope, they tend to disappear.  How do we recover the settings, if at
all?

David
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